Question

我的问题是当我滚动tableview时它无法正常工作。

例如我有2个部分而在第0部分我在单元格中使用个人资料图像，在第1部分我隐藏它们但是当我向下滚动时，图像正在丢失。我也有一个变量，当它好的时候我改变了第二个图像。但是当我滚动它的变化图像但是当我向下滚动它改变那些等于indexpath的图像时。

你可以在这里找到图像

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as! UserTableViewCell
    if self.itemInfo.title == "USERNAME" && indexPath.section == 0 {
        let user = self.users[indexPath.row]
        let friendImage = UIImage(named: "SearchPeopleAdded")
        for friend in self.friends {
            if friend.objectId == user.objectId {
                cell.groupAddImageView.image = friendImage
                cell.selectionStyle = .None
                cell.userInteractionEnabled = false
            }
        }

        cell.nameLabel!.text = user["username"] as? String

        if let image = user["avatar_image"] as? PFFile {
            cell.userImageView.sd_setImageWithURL(NSURL(string: image.url!))
        }

    }else if itemInfo.title == "ADDRESSBOOK" && indexPath.section == 1 {
        if isSearchActive == false {
            let person = contacts[indexPath.row]
            var firstName = person.name?.firstName
            var lastName = person.name?.lastName

            if firstName == nil || lastName == nil {
                if firstName == nil {
                    firstName = ""
                }
                if lastName == nil {
                    lastName = ""
                }
                if firstName == nil && lastName == nil {
                    if person.phones![0].number != nil {
                        firstName = person.phones![0].number
                        lastName = ""
                    }else {
                        firstName = ""
                        lastName = ""
                    }
                }
            }
            let fullName: String = firstName! + " " + lastName!
            cell.nameLabel.text = fullName
            cell.userImageView.hidden = true
        }else {
            let person = filteredAddressBookUsers[indexPath.row]
            var firstName = person.name?.firstName
            var lastName = person.name?.lastName

            if firstName == nil || lastName == nil {
                if firstName == nil {
                    firstName = ""
                    print("first name nil")
                }
                if lastName == nil {
                    lastName = ""
                    print("last name nil")
                }
                if firstName == nil && lastName == nil {
                    print("both nil")
                    if person.phones![0].number != nil {
                        firstName = person.phones![0].number
                        lastName = ""
                    }else {
                        firstName = ""
                        lastName = ""
                    }

                }
            }
            let fullName: String = firstName! + " " + lastName!
            cell.nameLabel.text = fullName
            cell.userImageView.hidden = true
        }
    }else if self.itemInfo.title == "ADDRESSBOOK" && indexPath.section == 0 {
        let user = self.addressMatchedUsers[indexPath.row]

        let friendImage = UIImage(named: "SearchPeopleAdded")
        for friend in self.friends {
            if friend.objectId == user.objectId {
                cell.groupAddImageView.image = friendImage
                cell.selectionStyle = .None
                cell.userInteractionEnabled = false
            }
        }

        cell.nameLabel!.text = user["username"] as? String

        if let image = user["avatar_image"] as? PFFile {
            cell.userImageView.sd_setImageWithURL(NSURL(string: image.url!))
        }
    }
    //configure(cell, forRowAtIndexPath: indexPath)
    return cell
}

Answer 1

创建UITableViewCell子类并覆盖prepeareForReuse函数 - 将单元格设置为默认/所需模式。

夫特：

override func prepareForReuse() {
    super.prepareForReuse()

    //set cell to initial/required state here 
}

准备一个可重用的单元格，供表视图的委托重用。

如果UITableViewCell对象是可重用的 - 也就是说，它具有重用标识符 - 在从UITableVie w方法dequeueReusableCellWithIdentifier:返回对象之前调用此方法。出于性能原因，您应该仅重置与内容无关的单元格属性，例如，alpha，编辑和选择状态。在tableView:cellForRowAtIndexPath:中，表视图的委托应始终在重用单元格时重置所有内容。如果单元对象没有关联的重用标识符，则不会调用此方法。如果重写此方法，则必须确保调用超类实现。

TableView无法正常工作

1 个答案: